Portion of a shoe sole



FIG. 1 is a bottom perspective view of a portion of a shoe sole showing our new design;

FIG. 2 is a side view thereof;

FIG. 3 is another side view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof.

The broken lines in the Figures shown environment for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a portion of a shoe sole, as shown and described. 